Jami` at-Tirmidhi 1292

Narrated Ibn 'Umar: That the Messenger of Allah (ﷺ) said: "None of you is to sell over the sale of others, nor to propose over the proposal of others." [He said:] There are narration on this topic from Abu Hurairah and Samurah. [Abu 'Eisa said:] The Hadith of Ibn 'Umar is a Hasan Sahih Hadith. And it has been reported from the Prophet (ﷺ) that he said: "Do not haggle in competition with your brother's haggling." And the meaning of sale in this Hadith of the Prophet (ﷺ), according to some of the people of knowledge is to haggle